1 Department of Small Animal Clinical Sciences, College of Veterinary Medicine and Biomedical Sciences, Texas A&M University, College Station, TX 77843, USA. Electronic address: jheatley@cvm.tamu.edu.
2 Department of Veterinary Pathobiology, College of Veterinary Medicine & Biomedical Sciences, Texas A&M University, TAMU-CVM Clinical Pathology, Building 1085, Room 2020, College Station, TX 77843-4457, USA. Electronic address: krussell@cvm.tamu.edu.